AFCT-5705LZ Avago Technologies US Inc., AFCT-5705LZ Datasheet - Page 4
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AFCT-5705LZ
Manufacturer Part Number
AFCT-5705LZ
Description
LX SFP Std Delatch RoHS
Manufacturer
Avago Technologies US Inc.
Series
-r
Datasheet
1.AFCT-5705LZ.pdf
(20 pages)
Specifications of AFCT-5705LZ
Mounting Type
SFP
Voltage - Supply
3.14 V ~ 3.47 V
Connector Type
LC Duplex
Applications
Ethernet
Wavelength
1310nm
Data Rate
1.25Gbd
Product
Transceiver
Maximum Rise Time
400 ps, 260 ps
Maximum Fall Time
400 ps, 260 ps
Pulse Width Distortion
0.227 ns, 0.267 ns
Operating Supply Voltage
3.14 V to 3.47 V
Maximum Operating Temperature
+ 85 C
Minimum Operating Temperature
- 10 C
Package / Case
SFP-20
Function
SFP Optical Transceivers with Optional DMI for Gigabit Ethernet
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
For Use With
Singlemode Glass
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
TX_FAULT
A laser fault or a low VCC condition will activate the
transmitter fault signal, TX_FAULT, and disable the laser.
This signal is an open collector output (pull-up required
on the host board); A low signal indicates normal laser
operation and a high signal indicates a fault. The TX_
FAULT will be latched high when a laser fault occurs and
is cleared by toggling the TX_DISABLE input or power
cycling the transceiver. The TX_FAULT is not latched for
Low VCC. The transmitter fault condition can also be
monitored via the two-wire serial interface (address
A2h, byte 110, bit 2).
Eye Safety Circuit
Under normal operating conditions, the laser power
will be maintained below the eye-safety limit. If the
eye safety limit is exceeded at any time, a laser fault will
occur and the TX_FAULT output will be activated.
Receiver Section
The receiver section for the AFCT-570 Z contains an
InGaAs/InP photo detector and a preamplifier mounted
in an optical subassembly. This optical subassembly is
coupled to a post amplifier/decision circuit on a circuit
board. The design of the optical subassembly provides
better than 12 dB Optical Return Loss (ORL).
Connection to the receiver is provided via a LC optical
connector.
RX_LOS
The receiver section contains a loss of signal (RX_LOS)
circuit to indicate when the optical input signal power
is insufficient for Fibre Channel compliance. A high
signal indicates loss of modulated signal, indicating
link failure such as a broken fiber or a failed transmit-
ter. RX_LOS can be also be monitored via the two-wire
serial (address A2h, byte 110, bit 1).
Figure 4. MSA required power supply filter
4
SFP MODULE
V
V
CC
CC
T
R
0.1 μF
0.1 μF
HOST BOARD
10 μF
1 μH
1 μH
0.1 μF
10 μF
3.3 V
Functional Data I/O
Avago’s AFCT-570 Z transceiver is designed to accept
industry standard differential signals. The transceiver
provides an AC-coupled, internally terminated data
interface. Bias resistors and coupling capacitors have
been included within the module to reduce the number
of components required on the customer’s board.
Figure 2 illustrates the recommended interface circuit.
Digital Diagnostic Interface and Serial Identification
The AFCT-570 Z family complies with the SFF-8074i
specification, which defines the module’s serial identi-
fication protocol to use the 2-wire serial CMOS EEPROM
protocol of the ATMEL AT24C01A or similar. Standard
SFP EEPROM bytes 0-255 are addressed per SFF-8074i at
memory address 0xA0 (A0h).
As an enhancement to the conventional SFP interface
defined in SFF-8074i, the AFCT-5705Z is also compliant
to SFF-8472 (the digital diagnostic interface for SFP).
This enhancement adds digital diagnostic monitoring
to standard SFP functionality, enabling failure predic-
tion, fault isolation, and component monitoring capa-
bilities.
Using the 2-wire serial interface, the AFCT-5705Z pro-
vides real time access to transceiver internal supply
voltage and temperature, transmitter output power,
laser bias current and receiver average input power,
allowing a host to predict system compliance issues.
These five parameters are internally calibrated, per the
MSA. New digital diagnostic information is accessed
per SFF-8472 using EEPROM bytes 0-255 at memory
address 0xA2 (A2h).
The digital diagnostic interface also adds the ability to
disable the transmitter (TX_DISABLE), monitor for Trans-
mitter Faults (TX_FAULT) and monitor for Receiver Loss
of Signal (RX_LOS).
Contents of the MSA-compliant serial ID memory are
shown in Tables 10 through 14. The SFF-8074i and SFF-
8472 specifications are available from the SFF Commit-
tee at http://www.sffcommittee.org.
Predictive Failure Identification
The diagnostic information allows the host system
to identify potential link problems. Once identified, a
fail-over technique can be used to isolate and replace
suspect devices before system uptime is impacted.